<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>
        <!-- 需要子模版自己去实现的部分 -->
        {% block title %}-{% endblock %}
    </title>
</head>
<body>
    hahah
    {% block body %}-{% endblock %}
</body>
</html>